In article ,
Spehro Pefhany wrote:

You might be able to do it with a vernier caliper.

24 gauge has a diameter of .511 mm or .0020"

30 gauge has a diameter of .255 mm or .001"

Ooops, you're low by a factor of 10:1 in the inch calculations. Just
as well, since a caliper is hardly repeatable to 1 thou, let alone
measuring a diameter of that size with any accuracy.

Yup, I added a zero in there. 24 gauge is 20 mils (.02"), 30 gauge is
half that.

Works out to 50 or 100 turns per inch, close-wound, and the suggestion
to use that method was probably the best and cheapest I've heard.

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Dave Platt AE6EO
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